Detect typing module attributes with 'import typing as <name>' (#632)

* added functionality to detect typing module attributes with 'import typing as <name>'

* remove async keyword from test_aliased_import

1 files changed, 17 insertions, 0 deletions

diff --git a/pyflakes/test/test_type_annotations.py b/pyflakes/test/test_type_annotations.py
index 6a66bcd..f3b6c24 100644
--- a/pyflakes/test/test_type_annotations.py
+++ b/pyflakes/test/test_type_annotations.py
@@ -121,6 +121,23 @@ class TestTypeAnnotations(TestCase):
             def f(self, x): return x
         """)
 
+    def test_aliased_import(self):
+        """Detect when typing is imported as another name"""
+        self.flakes("""
+        import typing as t
+
+        @t.overload
+        def f(s):  # type: (None) -> None
+            pass
+
+        @t.overload
+        def f(s):  # type: (int) -> int
+            pass
+
+        def f(s):
+            return s
+        """)
+
     def test_not_a_typing_overload(self):
         """regression test for @typing.overload detection bug in 2.1.0"""
         self.flakes("""